A 19-year-old soldier from Hawaii died during basic training at Fort Sill, officials told ABC affiliate KSWO News.According to KSWO, Austin Williander, from Waianae, Hawaii, died in August, and his body was flown to Oahu on Thursday. The Army is investigating his death, and his family said they were told he was dehydrated and may have suffered heatstroke during training, KSWO reported. Williander joined the Army after graduating from Waianae High School this year and had only been at Fort Sill for a few months.